How to use crontab to run timed events

Cron is a Linux utility that runs tasks in the background automatically at time intervals. The cron daemon, or service, initiates this task. That task is called a Cron job. You can find a list of these jobs in the Cron Table, also known as the Crontab. In this article you will learn about the command, how to use the command and command's syntax.

NOTE: If your name is on /usr/lib/cron/cron.allow, you will be able to create jobs in the crontab. If there is no file, check if there's /usr/lib/cron/cron.deny and see if your name is on there. If not you'll be free to create jobs. If neither file exists then only root can execute crontab.